{"id":"GRM-008","name":"Sequence of tenses","domain":"grammar","layer":"sentence","strength":"hard_constraint","human_logic":"IF a dependent clause is temporally related to a governing clause, THEN select tense and aspect that express the intended ordering ELSE do not normalize automatically.","when":{"all":[{"path":"sentence.main_clause.time","operator":"exists"},{"path":"sentence.dependent_clause.time_relation","operator":"exists"}]},"then":[{"action":"align","target":"sentence.dependent_clause.tense_aspect","value_from":"sentence.dependent_clause.time_relation"}],"else":[{"action":"retain","target":"current_text","reason":"No triggering condition is present."}],"unless":[],"because":"Tense and aspect encode whether events precede, overlap, or follow one another.","diagnostics":[],"examples":{},"source_ids":["BK-004","BK-010"],"laka":{"smallest_sufficient_intervention":true,"primary_axes":["scope","depth","magnitude","reversibility"]},"requires_facts":["sentence.main_clause.time","sentence.dependent_clause.time_relation"],"tests":[],"sources":[{"id":"BK-004","title":"English Grammar in Use","creator":"Raymond Murphy","domain":"learner_grammar","type":"Book","note":"Self-study explanations and practice for core English grammar.","url":null},{"id":"BK-010","title":"Practical English Usage","creator":"Michael Swan","domain":"usage_reference","type":"Book","note":"Advanced grammar and usage reference for learners and teachers.","url":null}],"defined_in":{"file":"07-core-grammar-rules.json","title":"Core Grammar Rules","slug":"core-grammar-rules"}}